iOS 邊下邊播的實(shí)現(xiàn)代碼
更新時(shí)間：2017年11月13日 11:52:58 投稿：mrr
在之前項(xiàng)目中使用的是AVPlayer直接播放URL地址，但是不知道是相機(jī)的wifi不夠穩(wěn)定還是代碼的問(wèn)題，app總是出現(xiàn)緩沖卡頓。后來(lái)考慮改成邊下邊播模式，下面小編給大家?guī)?lái)了iOS 邊下邊播的實(shí)現(xiàn)代碼，需要的朋友參考下吧
項(xiàng)目中之前使用的是AVPlayer直接播放URL地址，但是不知道是相機(jī)的wifi不夠穩(wěn)定還是代碼的問(wèn)題，app總是出現(xiàn)緩沖卡頓，就考慮改寫(xiě)成邊下邊播的模式，查過(guò)了許多資料，發(fā)現(xiàn)大部分都是用的同一種方法
AVAssetResourceLoaderDelegate 代理方法，來(lái)看看如何實(shí)現(xiàn)
首先要實(shí)現(xiàn)兩個(gè)必須的代理方法
AVAssetResourceLoaderDelegateObjective-C
#pragma mark - AVAssetResourceLoaderDelegate
//開(kāi)始加載
- (BOOL)resourceLoader:(AVAssetResourceLoader *)resourceLoader shouldWaitForLoadingOfRequestedResource:(AVAssetResourceLoadingRequest *)loadingRequest {
[self addLoadingRequest:loadingRequest];
return YES;
}
//取消加載
- (void)resourceLoader:(AVAssetResourceLoader *)resourceLoader didCancelLoadingRequest:(AVAssetResourceLoadingRequest *)loadingRequest {
[self removeLoadingRequest:loadingRequest];
}
#pragma mark - AVAssetResourceLoaderDelegate
//開(kāi)始加載
- (BOOL)resourceLoader:(AVAssetResourceLoader *)resourceLoader shouldWaitForLoadingOfRequestedResource:(AVAssetResourceLoadingRequest *)loadingRequest {
[self addLoadingRequest:loadingRequest];
return YES;
}
//取消加載
- (void)resourceLoader:(AVAssetResourceLoader *)resourceLoader didCancelLoadingRequest:(AVAssetResourceLoadingRequest *)loadingRequest {
[self removeLoadingRequest:loadingRequest];
}
然后要定義一個(gè)下載類(lèi)，其實(shí)就是分段下載數(shù)據(jù)的下載器
AVAssetResourceLoaderDelegateObjective-C
- (void)start {
NSMutableURLRequest * request = [NSMutableURLRequest requestWithURL:[self.requestURL originalSchemeURL] cachePolicy:NSURLRequestReloadIgnoringCacheData timeoutInterval:RequestTimeout];
if (self.requestOffset > 0) {
[request addValue:[NSString stringWithFormat:@"bytes=%ld-%ld", self.requestOffset, self.fileLength - 1] forHTTPHeaderField:@"Range"];
}
self.session = [NSURLSession sessionWithConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration] delegate:self delegateQueue:[NSOperationQueue mainQueue]];
self.task = [self.session dataTaskWithRequest:request];
[self.task resume];
}
#pragma mark - NSURLSessionDataDelegate
//服務(wù)器響應(yīng)
- (void)URLSession:(NSURLSession *)session dataTask:(NSURLSessionDataTask *)dataTask didReceiveResponse:(NSURLResponse *)response completionHandler:(void (^)(NSURLSessionResponseDisposition))completionHandler {
if (self.cancel) return;
SRQLog(@"response: %@",response);
completionHandler(NSURLSessionResponseAllow);
NSHTTPURLResponse * httpResponse = (NSHTTPURLResponse *)response;
NSString * contentRange = [[httpResponse allHeaderFields] objectForKey:@"Content-Range"];
NSString * fileLength = [[contentRange componentsSeparatedByString:@"/"] lastObject];
self.fileLength = fileLength.integerValue > 0 ? fileLength.integerValue : response.expectedContentLength;
if (self.delegate && [self.delegate respondsToSelector:@selector(requestTaskDidReceiveResponse)]) {
[self.delegate requestTaskDidReceiveResponse];
}
}
//服務(wù)器返回?cái)?shù)據(jù) 可能會(huì)調(diào)用多次
- (void)URLSession:(NSURLSession *)session dataTask:(NSURLSessionDataTask *)dataTask didReceiveData:(NSData *)data {
if (self.cancel) return;
//SRQLog(@"收到響應(yīng)了: %@",data);
self.cacheLength += data.length;
if (self.delegate && [self.delegate respondsToSelector:@selector(requestTaskDidUpdateCache)]) {
[self.delegate requestTaskDidUpdateCache];
}
}
//請(qǐng)求完成會(huì)調(diào)用該方法，請(qǐng)求失敗則error有值
- (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task didCompleteWithError:(NSError *)error {
if (self.cancel) {
SRQLog(@"下載取消");
}else {
if (error) {
if (self.delegate && [self.delegate respondsToSelector:@selector(requestTaskDidFailWithError:)]) {
[self.delegate requestTaskDidFailWithError:error];
}
}else {
//可以緩存則保存文件
if (self.cache) {
[FileHandle cacheTempFileWithFileName:[NSString fileNameWithURL:self.requestURL]];
}
if (self.delegate && [self.delegate respondsToSelector:@selector(requestTaskDidFinishLoadingWithCache:)]) {
[self.delegate requestTaskDidFinishLoadingWithCache:self.cache];
}
}
}
}
- (void)start {
NSMutableURLRequest * request = [NSMutableURLRequest requestWithURL:[self.requestURL originalSchemeURL] cachePolicy:NSURLRequestReloadIgnoringCacheData timeoutInterval:RequestTimeout];
if (self.requestOffset > 0) {
[request addValue:[NSString stringWithFormat:@"bytes=%ld-%ld", self.requestOffset, self.fileLength - 1] forHTTPHeaderField:@"Range"];
}
self.session = [NSURLSession sessionWithConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration] delegate:self delegateQueue:[NSOperationQueue mainQueue]];
self.task = [self.session dataTaskWithRequest:request];
[self.task resume];
}
#pragma mark - NSURLSessionDataDelegate
//服務(wù)器響應(yīng)
- (void)URLSession:(NSURLSession *)session dataTask:(NSURLSessionDataTask *)dataTask didReceiveResponse:(NSURLResponse *)response completionHandler:(void (^)(NSURLSessionResponseDisposition))completionHandler {
if (self.cancel) return;
SRQLog(@"response: %@",response);
completionHandler(NSURLSessionResponseAllow);
NSHTTPURLResponse * httpResponse = (NSHTTPURLResponse *)response;
NSString * contentRange = [[httpResponse allHeaderFields] objectForKey:@"Content-Range"];
NSString * fileLength = [[contentRange componentsSeparatedByString:@"/"] lastObject];
self.fileLength = fileLength.integerValue > 0 ? fileLength.integerValue : response.expectedContentLength;
if (self.delegate && [self.delegate respondsToSelector:@selector(requestTaskDidReceiveResponse)]) {
[self.delegate requestTaskDidReceiveResponse];
}
}
//服務(wù)器返回?cái)?shù)據(jù) 可能會(huì)調(diào)用多次
- (void)URLSession:(NSURLSession *)session dataTask:(NSURLSessionDataTask *)dataTask didReceiveData:(NSData *)data {
if (self.cancel) return;
//SRQLog(@"收到響應(yīng)了: %@",data);
self.cacheLength += data.length;
if (self.delegate && [self.delegate respondsToSelector:@selector(requestTaskDidUpdateCache)]) {
[self.delegate requestTaskDidUpdateCache];
}
}
//請(qǐng)求完成會(huì)調(diào)用該方法，請(qǐng)求失敗則error有值
- (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task didCompleteWithError:(NSError *)error {
if (self.cancel) {
SRQLog(@"下載取消");
}else {
if (error) {
if (self.delegate && [self.delegate respondsToSelector:@selector(requestTaskDidFailWithError:)]) {
[self.delegate requestTaskDidFailWithError:error];
}
}else {
//可以緩存則保存文件
if (self.cache) {
[FileHandle cacheTempFileWithFileName:[NSString fileNameWithURL:self.requestURL]];
}
if (self.delegate && [self.delegate respondsToSelector:@selector(requestTaskDidFinishLoadingWithCache:)]) {
[self.delegate requestTaskDidFinishLoadingWithCache:self.cache];
}
}
}
}
最后將拿到的數(shù)據(jù)塞進(jìn)AVAssetResourceLoaderDelegate代理中，交還給AVPlayer，就可以播放了
AVAssetResourceLoaderDelegateObjective-C
- (BOOL)finishLoadingWithLoadingRequest:(AVAssetResourceLoadingRequest *)loadingRequest {
//填充信息
CFStringRef contentType = UTTypeCreatePreferredIdentifierForTag(kUTTagClassMIMEType, (__bridge CFStringRef)(MimeType), NULL);
loadingRequest.contentInformationRequest.contentType = CFBridgingRelease(contentType);
loadingRequest.contentInformationRequest.byteRangeAccessSupported = YES;
loadingRequest.contentInformationRequest.contentLength = self.requestTask.fileLength;
//讀文件，填充數(shù)據(jù)
NSUInteger cacheLength = self.requestTask.cacheLength;
NSUInteger requestedOffset = loadingRequest.dataRequest.requestedOffset;
if (loadingRequest.dataRequest.currentOffset != 0) {
requestedOffset = loadingRequest.dataRequest.currentOffset;
}
NSUInteger canReadLength = cacheLength - (requestedOffset - self.requestTask.requestOffset);
NSUInteger respondLength = MIN(canReadLength, loadingRequest.dataRequest.requestedLength);
//SRQLog(@"好不容易填充一次");
[loadingRequest.dataRequest respondWithData:[FileHandle readTempFileDataWithOffset:requestedOffset - self.requestTask.requestOffset length:respondLength]];
//如果完全響應(yīng)了所需要的數(shù)據(jù)，則完成
NSUInteger nowendOffset = requestedOffset + canReadLength;
NSUInteger reqEndOffset = loadingRequest.dataRequest.requestedOffset + loadingRequest.dataRequest.requestedLength;
if (nowendOffset >= reqEndOffset) {
[loadingRequest finishLoading];
return YES;
}
return NO;
}
- (void)player{
self.resouerLoader = [[ResourceLoader alloc] init];
self.asset = [AVURLAsset URLAssetWithURL:[self.videoUrl customSchemeURL] options:nil];
[self.asset.resourceLoader setDelegate:self.resouerLoader queue:dispatch_get_main_queue()];
_playerItem = [AVPlayerItem playerItemWithAsset:self.asset];
_players = [AVPlayer playerWithPlayerItem:_playerItem];
}
- (BOOL)finishLoadingWithLoadingRequest:(AVAssetResourceLoadingRequest *)loadingRequest {
//填充信息
CFStringRef contentType = UTTypeCreatePreferredIdentifierForTag(kUTTagClassMIMEType, (__bridge CFStringRef)(MimeType), NULL);
loadingRequest.contentInformationRequest.contentType = CFBridgingRelease(contentType);
loadingRequest.contentInformationRequest.byteRangeAccessSupported = YES;
loadingRequest.contentInformationRequest.contentLength = self.requestTask.fileLength;
//讀文件，填充數(shù)據(jù)
NSUInteger cacheLength = self.requestTask.cacheLength;
NSUInteger requestedOffset = loadingRequest.dataRequest.requestedOffset;
if (loadingRequest.dataRequest.currentOffset != 0) {
requestedOffset = loadingRequest.dataRequest.currentOffset;
}
NSUInteger canReadLength = cacheLength - (requestedOffset - self.requestTask.requestOffset);
NSUInteger respondLength = MIN(canReadLength, loadingRequest.dataRequest.requestedLength);
//SRQLog(@"好不容易填充一次");
[loadingRequest.dataRequest respondWithData:[FileHandle readTempFileDataWithOffset:requestedOffset - self.requestTask.requestOffset length:respondLength]];
//如果完全響應(yīng)了所需要的數(shù)據(jù)，則完成
NSUInteger nowendOffset = requestedOffset + canReadLength;
NSUInteger reqEndOffset = loadingRequest.dataRequest.requestedOffset + loadingRequest.dataRequest.requestedLength;
if (nowendOffset >= reqEndOffset) {
[loadingRequest finishLoading];
return YES;
}
return NO;
}
- (void)player{
self.resouerLoader = [[ResourceLoader alloc] init];
self.asset = [AVURLAsset URLAssetWithURL:[self.videoUrl customSchemeURL] options:nil];
[self.asset.resourceLoader setDelegate:self.resouerLoader queue:dispatch_get_main_queue()];
_playerItem = [AVPlayerItem playerItemWithAsset:self.asset];
_players = [AVPlayer playerWithPlayerItem:_playerItem];
}
注意：此方法服務(wù)器端最好支持Range頭，這樣才是分段下載。
總結(jié)
以上所述是小編給大家介紹的iOS 邊下邊播的實(shí)現(xiàn)代碼，希望對(duì)大家有所幫助，如果大家有任何疑問(wèn)請(qǐng)給我留言，小編會(huì)及時(shí)回復(fù)大家的。在此也非常感謝大家對(duì)腳本之家網(wǎng)站的支持！
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